Revealing dipion correlations for the observed substructure near the $π^+π^-$ mass threshold in $ψ(3686)\to J/ψπ^+π^-$
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866910021369987072 |
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| author | Wang, Zhong-Yu Liu, Zhe Liu, Xiang |
| author_facet | Wang, Zhong-Yu Liu, Zhe Liu, Xiang |
| contents | Based on the world's largest $ψ(3686)$ data sample, the BESIII Collaboration recently reported a substructure near the $π^+π^-$ mass threshold in the decay $ψ(3686) \to J/ψπ^+π^-$, challenging the established understanding of the dipion invariant mass spectrum. We propose that this substructure arises directly from dipion correlations. Using a chiral unitary approach, we successfully reproduce the observed anomaly, thereby providing strong evidence of dipion correlation in heavy quarkonium decays. This approach also allows us to predict the corresponding dipion correlation function. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_10345 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revealing dipion correlations for the observed substructure near the $π^+π^-$ mass threshold in $ψ(3686)\to J/ψπ^+π^-$ Wang, Zhong-Yu Liu, Zhe Liu, Xiang High Energy Physics - Phenomenology Based on the world's largest $ψ(3686)$ data sample, the BESIII Collaboration recently reported a substructure near the $π^+π^-$ mass threshold in the decay $ψ(3686) \to J/ψπ^+π^-$, challenging the established understanding of the dipion invariant mass spectrum. We propose that this substructure arises directly from dipion correlations. Using a chiral unitary approach, we successfully reproduce the observed anomaly, thereby providing strong evidence of dipion correlation in heavy quarkonium decays. This approach also allows us to predict the corresponding dipion correlation function. |
| title | Revealing dipion correlations for the observed substructure near the $π^+π^-$ mass threshold in $ψ(3686)\to J/ψπ^+π^-$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.10345 |